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Stockholders' Equity - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2013
Qualified Stock Option Plans [Member]
Dec. 31, 2012
Qualified Stock Option Plans [Member]
Dec. 31, 2013
Non-Qualified Stock Option Plans [Member]
Dec. 31, 2012
Non-Qualified Stock Option Plans [Member]
Dec. 31, 2013
Preferred Share Rights Plan [Member]
Dec. 31, 2013
2008 Plan [Member]
Dec. 31, 2013
2008 Plan [Member]
Dec. 31, 2011
2008 Plan [Member]
Dec. 31, 2011
2008 Plan [Member]
Qualified Stock Option Plans [Member]
Dec. 31, 2011
2008 Plan [Member]
Non-Qualified Stock Option Plans [Member]
Dec. 31, 2013
2008 Plan [Member]
Non-Qualified Stock Option Plans [Member]
Dec. 31, 2006
2006 Options [Member]
Non-Qualified Stock Option Plans [Member]
Dec. 31, 2013
Outside Director Plan [Member]
Non-Qualified Stock Option Plans [Member]
Dec. 31, 2011
5.5% convertible debentures [Member]
Stockholders Equity [Line Items]                                
Number of common stock shares for issuance               1,000,000             400,000  
Minimum exercise price of stock option at grant date                 No less than 100% of the fair market value, as defined in the 2008 Plan, of the shares on the date of grant              
Percentage of fair market value                 100.00%              
Maximum term of stock option                 10 years              
Stock options available for grant               372,130             280,000  
Number of shares of stock options granted                       249,000 5,000   450,000    
Qualified and Non-Qualified Options vest at a percentage rate for first 5 years                   16.50%            
Qualified and Non-Qualified Options final year vesting                   End of the sixth year            
Exercisable period Non-Qualified Options following termination event                   Fully vested and exercisable for a period of one year from the date of the termination event            
Exercisable period after termination                   1 year            
Term of historical volatility of common stock 6 years                              
Total stock-based compensation expense not yet recognized, relating to non-vested stock options                 $ 4,405,000              
Exercise price of Options     $ 18.39   $ 8.96                 $ 8.01    
Stock option plans, options outstanding     413,405 478,915 186,225 258,050   402,405         31,225      
Stock options plan, options Exercisable                         22,625      
Principal amount converted   $ 26,900,000                            
Shares of LSB common stock issued   979,160                            
Interest rate on convertible debentures                               5.50%
Preferred share right plan description             If a person or group acquires 15% or more of our common stock, each Right will entitle the holder (other than the person or group that triggered the Rights being exercisable) to purchase shares of our common stock (or, in certain circumstances, cash or other securities) having a market value of twice the exercise price of a Right at such time                  
Minimum percentage of ownership of common stock required to exercise preferred share rights             15.00%                  
Exercise price of Preferred Stock             47.75 per one one-hundredth of a share                  
Redemption price preferred share rights             $ 0.01                  
Maximum time for redemption after the Rights become exercisable             10 days                  
Preferred share right exchange ratio             One common share per Right                  
Minimum percentage of beneficial ownership of common stock to end preferred share rights exchange             Until the person triggering the Right becomes the beneficial owner of 50% or more of our common stock.                  
Number of shares converted 1,500,000